In a valid document, at least two elements must be declared in the DTD.

Name: In a valid document, at least two elements must be declared in the DTD.
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Quizplus · Accepted Answer

A valid document requires that all elements used in the document are declared in the DTD, but there is no minimum number of elements that must be declared. A document can be valid with just one element declared.

In a Valid Document, at Least Two Elements Must Be